Analysis of the small punch creep test results according to the normalized lifetime fraction

The small punch creep test method was developed to complement the demerits of the existing uniaxial creep test method. A 10×10×0.5mm thin-plate specimen was used in the test, which could help save specimens and testing time. However, theories on the mechanism and significance of the small punch creep test have not been established clearly yet, and further research should be conducted. In this study, to analyze the behaviors of the small punch creep test, experiments were conducted using the interrupted small punch creep test method for five different lifetime fractions under the designed load and temperature using the Ni-base alloy, which is one of the very attractive candidate materials for the future advanced fossil power plant. The stress concentration part of the specimen, which is critical in analyzing the failure characteristics, was determined via FEM, and its effect on the failure mechanism was also studied through a microstructural analysis.